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FE Technical Forum / Setting the fuel pressure...
« on: June 11, 2016, 04:13:19 PM »
I know this is rather important, so I put some fuel in my baby today and pressurized my new system for the first time. Good news was there were no leaks, but the fuel pressure was acting oddly.
When I first turned on the pump it filled the carb (it is a QFT so it has the nice little windows - front one fuel was half way up the window, back one you can just see air at the top of the window). Initially the pressure ran up to between 6 and 7 PSI and I was pretty happy, but after checking for leaks I turned on the pump again, the gauge had shown pressure dropping to zero pretty quickly, but when the pump came on it shot up past 9 PSI, and it sat there. I turned it off and looked for the tools to adjust it, when I came back I tried it again, and it jumped to 9-10, then fell back to 6.
A few more tests and it is now consistently sitting above 9 PSI. I backed off the nut and backed out the screw as far as I dare, but the pressure is remaining up above 9 PSI.
What are the odds of a bad regulator vs a bad gauge? Is my process wrong (i.e. do I need to have the engine running to set the regulator?
When I first turned on the pump it filled the carb (it is a QFT so it has the nice little windows - front one fuel was half way up the window, back one you can just see air at the top of the window). Initially the pressure ran up to between 6 and 7 PSI and I was pretty happy, but after checking for leaks I turned on the pump again, the gauge had shown pressure dropping to zero pretty quickly, but when the pump came on it shot up past 9 PSI, and it sat there. I turned it off and looked for the tools to adjust it, when I came back I tried it again, and it jumped to 9-10, then fell back to 6.
A few more tests and it is now consistently sitting above 9 PSI. I backed off the nut and backed out the screw as far as I dare, but the pressure is remaining up above 9 PSI.
What are the odds of a bad regulator vs a bad gauge? Is my process wrong (i.e. do I need to have the engine running to set the regulator?